Consider the following.

x1 − x2 + 4x3 = 40
x1 + 3x2 = −8
−6x2 + 5x3 = 64

(a) write the system of linear equations as a matrix equation,
ax = b.

x1

x2
x3
=

(b) use gauss-jordan elimination on
[a b]
to solve for the matrix x.
x =

x1

x2
x3
=

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